Waterproofing compound and paper waterproofed thereby



Patented June 15, 1926.

UNITED STATES PATENT OFFICE.

HERBERT BUFFINGTON, OF SEATTLE, WASHINGTON, ASSIGNOR, BY MESNE ASSIGN MENTS, TO BUFFINGTON WATERPROOF PAPER CORPORATION, OF SEATTLE, WASH INGTON, A CORPORATION OF WASHINGTON.

I WATERPROOFING COMPOUND AND PAPER WATERPROOFED THEREIBY.

No Drawing.

My invention relates to compounds which are employed for waterproofing such materials as aper,

The ject of my invention is to improve upon compounds previously used for like purposes, and particularly to produce a com.-

- pound which may be used to produce a high applying them are as hereinafter set forth quality waterproof paper suitable for books, and particularly memorandum and record books which will at times be subjected to the minor other dampening influences.

-My invention comprises a compound having the ingredients proportioned and combined in t dients together with their relative proportions and the manner of compoundlng and it being understood that a reasonable de parture from the exact proportions named may be employed. 7

- The materials employed by me and their preferred proportions are as follows:

J Per cent. Zinc oxide 37% Starch 5 Boiled; linseed oil '5 A volatile organic solvent 12 White damma'r varnish A 39 A scenting or deodorizing oil 1 are 'As an example of the solvent to be em;

ployed the product which is known to the trade as Oronite light solvent may be named. This is a hydrocarbon derivative of petroleum having a low boiling point ranging in properties between "a high flash gasoline and petroleum ether. It is frequently employed in the manufacture of paints and as a solvent. and cleaner. I

The volatile characteristics of the solvent used should be such that it will entirely evaporate.- from the finished product. Solvents not of petroleum origin, such as alcohols, others and analogous volatile prodfrom coal distillation may be employed.

I e manner to be hereinafter defined, the same being employed as stated towaterproof paper. The preferred ingre-' Application filed March 18,.1925. Serial No. 16,580. Y

This is prepared and combined as follows:

The zinc oxide, linseed oil and dammar varnish are mixed and well ground together. The starch is incorporated with the solvent. The two compounds thus formed are thoroughly mixed together and the scenting oi deodorizing oil added last. 1 Zinc oxide is employed largely as a filler and as a color determining agent. Its use without other coloring pigment produces a. white product. If a colored product is wanted a colored pigment or pigments are employed, either supplemental to or in part replacement of the zinc oxide.

Dammar varnish is preferred to other analogous resins because of ts superior.

substitutedtherefor. This may be omitted.

or varied in amount as circumstances or requirements vary. V After the complete compound has been assembled it is applied to the paper by immersing the paper therein until it has become well impregnated therewith. It is then dried-whereupon it-is ready for use. Avariation in the proportions is required to best adapt the waterproofing material to different qualities-of paper and especially as regards, the proportion of volatile organic solvent used. When the paper is very absorbent. an'increased proportion of the volatile solvent may and should be used.

This may be increased to asmuch as three parts of solvent to one of zinc oxide for avery absorbent paper whilefor a non-absorbent sheet little or no increase is necessary.

A paper prepared by the application of the above compound becomes highly resistant to the action'of Water, retains its normal color and surface appearance and will readily take figures and Writing'whether made with a pencil r ink. It is therefore highly desirable for engineersland contractors field notes, tally sheets and books, and

all purposes Where moisture would affect or-' dinary or untreated paper.

Paper 30 treated is als" excellently adapted for making containers in which waterproof quality is desirable. Containers made of such paper may be employed'for holding liquids for considerable time.

What I claim as my invention is: .1. A waterproofing compound for paper and like 'fabrics composed of the following ingredients in substantially the proportions given:

'2. A paper water-proofed by treatment in a bath containing zinc oxide, 37%%; boiled linseed oil, white dammar v'arnish, 39%; starch, 5%; a'volatile organic solvent, 12 Signed at Seattle, Kin County, Washington, this 12th day of arch, 1925. 1 r

HERBERT- BUFFINGTON. 

